Evolution of a Cambrian active continental margin: The Delamerian–Lachlan connection in southeastern Australia from a zircon perspective

Fergusson, C. L.; Nutman, Allen P.; Kamiichi, Tomoyuki; Hidaka, Hiroshi

doi:10.1016/j.gr.2013.03.006

Cited by 38 publications

(13 citation statements)

References 84 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Triangle Formation-type section is located south of Rockley ( Figure 1c) and was first described by Stanton (1956) as a succession of shales, sandstone, chert, and tuff, dominated by siltstone and feldspathic Glen et al, 2017). Sources of published ages: SG-Sunbury Group (Squire et al, 2006); Oww3, Oww5, Bun4, Bun8, Bun9, and Mum1 (Glen et al, 2017); HQ09 and MVP (Fergusson et al, 2013); AGO, AGL, AGM, and Coombing Formation ; Mitchell Formation and part of the Fairbridge Volcanics (Zhang et al, 2019); other Fairbridge Volcanics data and the Ranch member . *Byng Volcanics age is after Crawford, Meffre, et al (2007), and the geochemistry analysis is from this study.…”

Section: 1029/2019tc005480mentioning

confidence: 99%

“…Composite stratigraphic columns of the Lachlan Orogen (after Glen et al, ). Sources of published ages: SG‐Sunbury Group (Squire et al, ); Oww3, Oww5, Bun4, Bun8, Bun9, and Mum1 (Glen et al, ); HQ09 and MVP (Fergusson et al, ); AGO, AGL, AGM, and Coombing Formation (Meffre et al, ); Mitchell Formation and part of the Fairbridge Volcanics (Zhang et al, ); other Fairbridge Volcanics data and the Ranch member (Glen et al, ). *Byng Volcanics age is after Crawford, Meffre, et al (), and the geochemistry analysis is from this study.…”

Section: Regional Geological Settingmentioning

confidence: 99%

See 1 more Smart Citation

Lachlan Orogen, Eastern Australia: Triangle Formation Records the Late Ordovician Arrival of the Macquarie Arc Terrane at the Margin of Eastern Gondwana

et al. 2019

View full text Add to dashboard Cite

The Ordovician intraoceanic Macquarie Arc terrane is faulted against coeval, quartz‐rich turbidites of the Adaminaby Group within the Lachlan Orogen of eastern Australia. Debates exist concerning the polarity of subduction beneath the Macquarie Arc and the nature of its emplacement, given it is juxtaposed against the Adaminaby Group to both the west and east. We present new provenance and zircon analyses of the Triangle Formation, which consists of interleaved quartz‐rich passive margin sandstones and island arc volcaniclastic rocks. In contrast, the structurally underlying Adaminaby Group contains no volcaniclastic detritus and displays a strong passive margin affinity. One sample from the Triangle Formation yielded a youngest zircon age of 456 ± 16 Ma indicating a subtle Macquarie Arc signature among an overwhelmingly Neoproterozoic and older Gondwanan provenance. The Adaminaby Group yielded a youngest zircon age of 481 ± 6 Ma and a strong Gondwanan zircon signature. We compared these results with volcaniclastic rocks from the Weemalla Formation stratigraphically higher in the Macquarie Arc, which yielded a distinctly unimodal zircon age of 451 ± 8 Ma, which is indistinguishable from the youngest zircon in the Triangle Formation. We suggest the Triangle Formation represents trench fill material sourced predominantly from the Gondwana margin but including some younger Macquarie Arc detritus. This constrains the initiation of this arc‐continent collision to between 448 and 462 Ma (Late Ordovician).

show abstract

Section: 1029/2019tc005480mentioning

confidence: 99%

Section: Regional Geological Settingmentioning

confidence: 99%

Lachlan Orogen, Eastern Australia: Triangle Formation Records the Late Ordovician Arrival of the Macquarie Arc Terrane at the Margin of Eastern Gondwana

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In referring to Sircombe's (1999) 700À500 Ma PacificÀGondwana Igneous Province as 600À500 Ma, Fergusson et al (2013Fergusson et al ( , pp. 1060Fergusson et al ( , 1061 seem to overlook the 700À600 Ma sub-cluster (d2) zircons in the Late Cambrian units and Ordovician turbidites of the LO and derivatives (Figure 2i, j).…”

Section: Dearth Of Primary Zircons In Eastern Australia and Antarcticmentioning

confidence: 99%

“…1060Fergusson et al ( , 1061 seem to overlook the 700À600 Ma sub-cluster (d2) zircons in the Late Cambrian units and Ordovician turbidites of the LO and derivatives (Figure 2i, j). The 700À600 Ma sub-cluster (d2) is an essential part of the dC 700À500 Ma cluster, as seen in the PDP of their pooled samples (Fergusson et al 2013(Fergusson et al , p. 1058. Its significance comes from the fact that no primary zircons of this age are known in eastern Australia and Antarctica outside the East AfricanÀAntarctic Orogen.…”

Section: Dearth Of Primary Zircons In Eastern Australia and Antarcticmentioning

confidence: 99%

See 1 more Smart Citation

Beach sand of SE Australia traced by zircon ages through Ordovician turbidites and S-type granites of the Lachlan Orogen to Africa/Antarctica: a review

Veevers

2015

Australian Journal of Earth Sciences

View full text Add to dashboard Cite

U‐Pb‐Hf‐REE‐Ti zircon and REE garnet geochemistry of the Cambrian Attunga eclogite, New England Orogen, Australia: Implications for continental growth along eastern Gondwana

et al. 2017

View full text Add to dashboard Cite

The timing and location of eclogite metamorphism is central to understanding subduction events responsible for the assembly of eastern Gondwana. The Attunga eclogite is one of only six eclogites in Australia and occurs as small blocks within a schistose serpentinite mélange known as the Weraerai terrane, along the Peel Fault of the southern New England Orogen. Our zircon data reveal the presence of high Th/U oscillatory zoned magmatic zircon with a weighted mean 206Pb/238U age of 534 ± 14 Ma and recrystallized metamorphic domains with an age of 490 ± 14 Ma. The latter have lower Th/U ratios, mostly no Eu anomalies and heavy rare earth element (HREE)‐depleted patterns. Garnet rims demonstrate that the final stages of garnet growth occurred in a HREE‐depleted environment, due to coeval formation with metamorphic zircon. Direct application of the Ti‐in‐zircon thermometer to metamorphic zircon yields temperatures of 770–610°C. Hf isotopic analyses of the zircons have an average εHf(t) of +13, indicating a juvenile crustal signature. We interpret the Attunga eclogite to be an indicator of Late Cambrian subduction beneath an oceanic suprasubduction zone prior to accretion against eastern Gondwanan in the latest Devonian. Phillips et al. () suggest two metamorphic age populations within the Attunga eclogite, based on U‐Pb zircon and 40Ar/39Ar phengite data. These are ~515 Ma and ~480 Ma. We confirm these data, but our zircon trace element chemistry data indicate that the Early Cambrian age (530 Ma) represents igneous protolith formation rather than eclogite metamorphism.

show abstract

Evolution of a Cambrian active continental margin: The Delamerian–Lachlan connection in southeastern Australia from a zircon perspective

Cited by 38 publications

References 84 publications

Lachlan Orogen, Eastern Australia: Triangle Formation Records the Late Ordovician Arrival of the Macquarie Arc Terrane at the Margin of Eastern Gondwana

Lachlan Orogen, Eastern Australia: Triangle Formation Records the Late Ordovician Arrival of the Macquarie Arc Terrane at the Margin of Eastern Gondwana

Beach sand of SE Australia traced by zircon ages through Ordovician turbidites and S-type granites of the Lachlan Orogen to Africa/Antarctica: a review

U‐Pb‐Hf‐REE‐Ti zircon and REE garnet geochemistry of the Cambrian Attunga eclogite, New England Orogen, Australia: Implications for continental growth along eastern Gondwana

Contact Info

Product

Resources

About